Factor # 1: Hair Growth CycleBasically there are three stages of hair: growing, resting and transitional. At any given time approximately 80 – 90% of hair follicles are in the growing phase and the rest are either in the transitional phase (2- 3%) or in the resting phase (10 – 15%).
What this means: There is probably some hair underneath the skin growing that hasn’t reached the surface yet, or it is above, but isn’t long enough to be grasped. So of course waxing wouldn’t be removing these hairs and in the next days or weeks to come you will see it noticeably appear.
If you get waxed in a row (every 2 -4 weeks) for a couple of times after your first appointment then all hair will have had the chance to be removed from the root and you'll be able to go longer between appointments.
Factor # 2: Personal Hair Growth CycleDifferent areas of the face and body don't spend the same amount of time in these three phases. Men and women have also been found to spend different amounts of time in the growth hair phase, even in the same body area. Age, season, hormone levels and genetics also play a part.
What this means: Your leg waxing won't necessarily last you the same amount of time as your friend's or grow back in sync with the bikini wax you got on the same day. Even if the areas you got waxed essentially have the same hair growth cycles, you'll notice thick or dark hair (like in the bikini line) much more than fine, light facial hair re-growth.
Factor #3: BreakageWhen the hair is being waxed, instead of being removed from the root, it can break off above or even below the skin's surface. Although professionals can break the hair, it's much more likely if you do your own.
What this means: You'll see hair much sooner than you have to, and because breakage creates a sharp edge, often ingrown hair follows.